Over time GDP will increase. The trend is a straight linear line however, the actual growth looks a bit like a wave.
Boom- high aggregate demand- this can be solved by automatic stabilisers- a increase in imports will cause A.D to shift back in as imports is a negative component of the A.D formula
Bust- low aggregate demand- this can also be solved by automatic stabilisers- a decrease in imports will cause A.D to shift out, again, because imports is a negative component of the A.D formula
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